Research Of Last CAD/CAM Technology

Last is very important in the whole industry of shoemaking and is the benchmark of shoe style in the shoemaking technology. The change of the shoe style directly depends on the last shape, and the quality of the last directly has direct affect on the quality of the shoe. The traditional manual method of last making, which is time-consuming, lower precision and inefficient, has become one of the bottles of the shoemaking industry. The fast development of the computer and CAD/CAM technology has made the automatization of last designing and making to be very possible. Now there is no very good last CAD/CAM technology in our country, in order to accelerate the development of our country's last industry, based on the 3D surface data of last, the paper has done some systemic and embedded research of last CAD/CAM technology, combining the need of real work presented the basic functions and realization method of last CAD, completed the design of the last CAM system, and gotten some innovative and applied achievements.In the research of last CAD technology, last putting together and smoothing, last scaling, last actively and freely adjusting have been completed in the paper. The new last styles can be made using these functions, the speed is fast, the decision is high, and the efficiency of the last designing has been improved highly.In the research of last CAM technology, a method of the tool-path generation based on the discrete points of free surface in the last NC processing is presented. The method has the properties of fast speed and high precision, can completely satisfy the precision of real processing.The method presented in the paper has been used to generate the tool-path in last NC processing. The method doesn't have strict limit on the free surface, so it can used to generate tool-path in many other things.The author of the paper have completed a last CAD/CAM software, which is realized in Windows98 operating system, and the functions discussed above have been completed in the software. The software is completed in the Visual C++ program environment, and using insetted OpenGL API functions as the 3D display environment, the result can be real time observed in the screen and has third dimension.